Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Pia Barrett,
Was Office purchased through a personal Microsoft account, or through a Microsoft 365 business account?
The steps for adding a tax ID in the Microsoft 365 admin center apply only to business billing, so they may not apply to your purchase. For a personal Microsoft Store purchase, check the order and tax invoice under your Microsoft account’s Order history.
If the invoice has already been issued without your NZ GST number, you would need to contact Microsoft billing support to confirm whether it can be amended or reissued. Since this is a public community forum, we cannot access or modify the invoice here.